[RobertHB]

Dead Foamers,
i want to create an inlet boundary condition for a scalar value. The inlet rate should depent on the scalar concentration in the cells connected to my inlet patch. So that if cell value = 0, the inlet value will be 1.0 and vice versa. Any anything in between.
Therefore i would like to know if there is any way to determine the cell value during runtime?

Regards,
Robert

[RobertHB]

So, after a bit of digging i came with the idea of using the codedFixedValue BC.

code
        #{
            // look up patch fields directly:
            const scalarField& cPatchField = 
                this->patch().lookupPatchField<volScalarField, scalar>("psi");
        
            // Calculate the average field
            const surfaceScalarField cAvg = 
                cPatchField.average(patch().boundaryMesh().mesh().V());
        
            operator == (1.0-cAvg);
            //this->value() = 1.0-cAvg;
        
        #};

It seems, the "lookup" of the patch value works. But OpenFOAM complains that "const scalarField has no member named ‘average’".
So, the question is: How do i calculate the average, or in the best case the weighted average, of my scalar boundary field?

Regards,
Robert